Lifting-jack



(No Model.)

I. N. GROVES.

LIFTING JACK. N0 432,732. Patented July 22,1890.

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ISAAC N. GROVES, OF MONTESANO, VASIUNGTON.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 482,732, dated July 22,1890. Apnlicatioll tiled April 2l, 1890. Serial No. 348,761. (No model.)

To all whom, t may concern.-

Be it known that I, Isaac N. Gnovns, a citizen of the United States,residing at Montcsano, in the county of Chehalis and State ofVashingtomhave invented a new and useful Lifting-J ack, of which thefollowing is a specification.

The invention relates lifting-jacks.

The object of the present invention is to provide a simple andinexpensive lifting-jack adapted to be readily used for vehicles and formovingl lumber and kindred purposes.

The invention consists in the construction and novel combination andarrangement of parts, which will be hereinafter fullydescribed,illustrated in the accompanying drawings, and particularlypointed out in the claims hereto appended.

In the drawings, Figure 1 is a perspective view of the lifting-jackconstructed in accordance with this invention. Fig. 2 is avertieallongitudinal sectional view. Fig. 3 is a horizontal sectional view. Fig.4 is a detail view of the standard.

Referring to the accompanying drawings, 1 designates the standard,whichis provided at one side with a recess 2, that extends from itsupper end 3 about half the length of the standard, and is adapted toreceive avertical movable jack-bar 4. The jack-bar 4 is rounded at 5 andconforms to the configuration of the recessed portion 2 of the standardand is adapted when in its lowest position to form a continuation of thestandard and have its faces Hush with the faces of the standard. Thestandard is provided with a longitudinal groove 6 and a slot 7, whichcommunicates with the groove, that extends longitudinalljT along therecessed portion 2 and is adapted to to improvements in receive arack-bar 8, which is seated in a similar groove 9 of the jack-bar and isprovided at its upper e'nd with a point 10 and at its lower end with aperforation 11, through which passes a screw orsimilar means forsecuring the rack-bar to the jack-bar. The jack-bar is maintained atlany desired elevation by a spring-actuated pawl l2, which is T-shapedand is arranged in a slot or hole 13, and has coiled upon it a spiralspring 14, that engages a shoulder 15 in the slot or hole 13 and thecross-bar 16 of the pawl, and forces the latter 'rack-bar and withdrawit therefrom.

in engagement with the teeth. The ends of the cross-bar 1G of the pawlare arranged in slots 17 of one of a pair of metallic straps 13 and 1S),that have their ends secured to the side faces of the standard and formguides or keepers for the j ack-bar. The rack-baris engaged by a lever20, which is pivotcd in the slot 7 of the standard 1, and is providedwith a longitudinal slot 21, through which the pivot 22 passes, wherebythe lever 2O is capable of a limited longitudinal movement and isadapted to engage a tooth of the rack-bar, lift the jack-bar, and bewithdrawnfrom engagement with said tooth and brought in engagement withanothertooth to againlift the jackbar, and as the latter is elevated thespringactuated pawl 14 engages the teeth and prevents the j ack-bardropping when the lever 20 is withdrawn from engagement with therackbar. The lever 2O is connected by plates 23 with an operating-lever24, which has one end pivotcd between perforated ears 25 of a plate 2G,that is secured to the standard, and the said plates 23 are arrangedupon each side of the levers 2O and 24 and are pivotally connectedthereto, and vthe vlower pivot 27 is adapted to be adjusted in theopenings 28 of the operating-lever 24 to vary the force of the pull andthe stroke of the operating-lever. The plates 23 are also provided withadjusting-openings 29, and they are capable of a limited movement on theoperating-leverand are adapted to alternately engage a projecting lug 30and plates 3l to move the lever20 and force it into engagementwith theteeth of tle T e upper edge of the operating-leveris provided withnotches 32, in one of which is arranged the' lug 30, that is adapted tobe adjusted along the lever and that projects laterally from both sidesof the same, and the plates 3l are arranged upon eacli side of theoperatinglever and are provided with flanges 32* to engage the plates23, and they are connected by a rivet 33, which is arranged in a slot 34of the operating-lever 24 and permits the plate 31 to move freely andadj ust itself tothe plates 23.

The lifting-jack is provided with suitable metallic plates to protectthe part from wear and strengthen the same, and it has secured to itslowerend a metallic band 35, which pro- IOO jects below the standard andis adapted to engage the supporting-surface and prevent the standardslipping, and the upper end of the jaek-bar is provided with a pivotedplate 36, that has its end 37 pointed and adapted to receive betweenthem an axle, or to engage a piece ot' lumber and prevent the lumber oraXle slipping from the jack.

It will readily be seen that the lifting-jack is simple and economic inconstruction and is adapted to be readily operated, and is capable ofvehicle, lumber, and kindred uses.

Having thus described my invention, I claim- 1. The combination, in alifting-jack, of the standard, the vertically-movable jack-bar pro-`vided With a rack, the spring-actuated pawl arranged to engage the rack,the lever 20, pivoted in the standard and provided with a longitudinalslot and capable of longitudinal movement and arranged to engage thesaid rack, and the operating-lever connected With the lever 20,substantially as described.

2. The combinatiomin a lifting-jack, of the standard, thevertically-movable jack-bar provided With a rack, the springactuatedpaWl, the slotted lever 20, pivotally mounted in the standard andcapable of longitudinal movement and arranged to engage the rack-bar,

and provided with the lug 30 and the plates 31, and theconnecting-plates 23,having their ends pivoted to the levers and beingarranged to be alternately engaged by the lug and the plates 3l,substantially as described.

3. The combination, in a liftingjack, of the recessed standard, thejack-bar similarly recessed and provided with a rack, the metallicstraps having their ends secured to the sides of the standard andforming keepers or guides for the spring-actuated pawl, thelongitudinally-slotted lever 20, capable of longitudinal movement andarranged to engage the rack, the operating-lever 24, pivoted to theplate 26, provided with notches 32 and the slot 34 and having the lug 30arranged in one of the notches and the plates pivotally mounted in theslot 34, and the connecting-plates pivoted to the levers and arranged tobe alternately engaged by the lug and the plates, substantially asdescribed.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

ISAAC N. GROVES.

B. P. BRIscoE, LEWIS B. BIGNOLD.

